3 Speed auto

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dooley1414
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#1 3 Speed auto

Post by dooley1414 » Sun Jun 02, 2019 5:24 pm

Hi all.... not asked a question for a while so here goes.... (hope someone can help) no doubt someone can....

I'm not sure if my 3 speed auto. box is going in to top gear?
What would anybody think the revs. should be at 60mph? my rev. counter at 60mph. is about 2500rpm. is this about right?

:helpsos:

Des.... Series 3 V12 1971 auto.
Ex. Texas Import 1971 Series 3 V12
Des. Suffolk.

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Heuer
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#2 Re: 3 Speed auto

Post by Heuer » Sun Jun 02, 2019 5:37 pm

Does it have a 3.31 or 3.07 rear axle ratio? If it is a USA car then I presume it is 3.31 which means it would be 2600 rpm at 60mph in top (1.00:1). The V12 is red-lined at 6,000 rpm and that would give a top speed of about 140mph which is about right.
David Jones
S1 OTS OSB; S1 FHC ODB

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#3 Re: 3 Speed auto

Post by dooley1414 » Sun Jun 02, 2019 5:56 pm

Hi.... that I'm not sure? Is there a. easy way to tell? Def. Ex. U.S. Car.
Ex. Texas Import 1971 Series 3 V12
Des. Suffolk.

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#4 Re: 3 Speed auto

Post by mgcjag » Sun Jun 02, 2019 6:15 pm

Hi Des.....to tell what ratio diff u have look at the rear cover plate on the diff...at about the 6 o/c position a small lable/metal tag with the ratio stamped on it.....or jack up rear and count how many turns of prop to turn road wheel once......however.....look at the service manual auto gearbox section......drive under light acceleration...1-2nd gear change at about 8-16 mph.....2nd - 3rd about 20-31 mph......watch the rev counter you will see it dip as you change up.......have you tried changing gear manually...Steve
Steve
1969 S2 2+2 & Building a C type replica

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driver
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#5 Re: 3 Speed auto

Post by driver » Sun Jun 02, 2019 6:24 pm

Hi, that sounds about right ,I have a 3 speed auto.
v12 etype 2+2

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#6 Re: 3 Speed auto

Post by dooley1414 » Sun Jun 02, 2019 6:46 pm

mgcjag wrote:
Sun Jun 02, 2019 6:15 pm
Hi Des.....to tell what ratio diff u have look at the rear cover plate on the diff...at about the 6 o/c position a small lable/metal tag with the ratio stamped on it.....or jack up rear and count how many turns of prop to turn road wheel once......however.....look at the service manual auto gearbox section......drive under light acceleration...1-2nd gear change at about 8-16 mph.....2nd - 3rd about 20-31 mph......watch the rev counter you will see it dip as you change up.......have you tried changing gear manually...Steve
Hi Steve.... I may be sounding stupid but how would I do it manually? Des.
Ex. Texas Import 1971 Series 3 V12
Des. Suffolk.

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#7 Re: 3 Speed auto

Post by mgcjag » Sun Jun 02, 2019 6:53 pm

How many positions do u have on your gear lever...D for auto gear change or you can select a gear and drive it like a manual car....1 to start...2 to change up to 2nd.....D to change up to 3rd
Steve
1969 S2 2+2 & Building a C type replica

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#8 Re: 3 Speed auto

Post by dooley1414 » Sun Jun 02, 2019 7:40 pm

mgcjag wrote:
Sun Jun 02, 2019 6:53 pm
How many positions do u have on your gear lever...D for auto gear change or you can select a gear and drive it like a manual car....1 to start...2 to change up to 2nd.....D to change up to 3rd
Hi Steve.... sorry yes I have D.... 1 and 2..... I'll try that in 1 and 2 then see if there is a rev. counter and a significant change when I go in to D....
Thanks.
Ex. Texas Import 1971 Series 3 V12
Des. Suffolk.

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#9 Re: 3 Speed auto

Post by dooley1414 » Mon Jun 03, 2019 10:46 am

Hi Steve thanks for your help last night I've tried the manual version of changing gear and I've definitely got first second and third and then I stopped again I thought I'd try in the drive position again and it seemed to have woken up doing it manually.... now the automatic (D position) way I've definitely got the first second and third significant changes in the running of the gearbox. Now to re sort out my leak on the gear box sump.... again.... :seeingstars: Thanks again Everyone and Steve.
Ex. Texas Import 1971 Series 3 V12
Des. Suffolk.

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#10 Re: 3 Speed auto

Post by mgcjag » Mon Jun 03, 2019 10:49 am

Hi Des...if you had mentioned a gearbox leak i would have sugested check the oil level as this can affect gear change..Steve
Steve
1969 S2 2+2 & Building a C type replica

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#11 Re: 3 Speed auto

Post by dooley1414 » Mon Jun 03, 2019 11:02 am

Hi Steve.... I did think that but always checked and topped up if necessary? It's only a drip now and again.... I have already changed the sump gasket once but didn't put any sealant on it didn't really think it would be necessary but wish I had now (belt and braces) got to do all over again now. Des.
Ex. Texas Import 1971 Series 3 V12
Des. Suffolk.

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